昌图断陷特征与油气分布规律

发布时间：2018-07-07 16:33

本文选题：昌图断陷 + 九佛堂组和沙海组　；参考：《长江大学》2015年硕士论文

【摘要】：松南地区近年来呈现出良好的勘探势头。近年来,中石化、中石油集中优势力量,通过地震、测井、地质等多种勘探研究手段,对松辽盆地南部诸多断陷实施了大规模勘探及研究工作,对松南地区的地层分布特征、沉积背景、生烃条件及储层岩石学等特征有了更进一步的了解。石油地质工作者们认识到松南地区并非只有陆家堡断陷有较大勘探潜力,中部昌图断陷同样勘探潜力巨大。综合应用钻井、测井、岩心、露头及地震资料,开展昌图断陷地层特征的研究。在对地层特征研究的基础上,通过对昌图断陷二维地震资料精细构造地层解释,研究断陷构造特征及演化特征；结合取芯、单井和井间的沉积相、亚相和微相研究,确定盆地沉积充填演化规律模式；综合运用地球化学数据,储层物性数据及油藏描述数据,确定断陷成藏地质条件,并在此基础上,总结其油气分布规律的特征。通过细致研究,我们得出以下认识：1、昌图断陷结构特点：整体为一西断东超近南北走向的箕状断陷。北深南浅,呈“下断上坳”的二元结构。南北存在差异：北部双断式两洼夹一隆、中部和南部为断阶式隆洼结构。六个构造单元：由北向南依次分为北部洼陷带、中部隆起带、南部主洼带、南部构造带、南部次洼带、东部斜坡带。2、受古构造和构造运动的控制,地层总体呈西厚东薄,向盆边尖灭为特征。西缘由于于受昌图断裂影响发育扇体沉积,主物源由东北向以辫状河三角洲形式注入,岩性总体呈现东部粗西部细的特点。与上伏沙海组及下覆九佛堂组均呈现微角度不整合。3、根据区域资料,总结沉积旋迥与岩性组合、古生物组合特征、标志层、地震反射特征等方面,开展了松南新区地层划分与对比,结果表明昌图断陷主要目的层九佛堂组地层发育,岩性以砂泥岩为主,夹凝灰岩或火山角砾岩,纵向上呈向上变细为主的沉积特征,平面上不同区块岩性组合存在差异。4、沉积储层研究表明,昌图断陷南部次凹存在东西双向物源,西面为断裂带,坡陡水深,为快速堆积的产物,主要为粗碎屑沉积,为扇三角洲沉积,主要岩性为凝灰质角砾岩,凝灰质砂砾岩；东面坡度相对较缓,沉积厚度较薄粒度较细。为辫状河三角洲沉积,主要岩性为细砂岩、粉砂岩。5、昌图断陷具有完备的生储盖组合：主要有一套烃源岩层,即九佛堂组暗色泥岩,发育2套储层,即：九佛堂组泥岩段所夹砂岩,沙海组所夹砂岩及砂砾岩。纵向和横向划分出两类有效的油气成藏组合：自生自储型成藏组合、上生下储型成藏组合,以自生自储最为重要。6、昌图断陷九佛堂组暗色泥岩发育,为主要的烃源岩层系。通过对烃源岩厚度统计,昌图断陷自下而上发育下白垩统九佛堂组、沙海组及阜新组三套烃源岩层,烃源岩岩石类型为暗色泥质岩、碳质泥岩和煤层及少量油页岩。烃源岩主要发育在九佛堂组的中上部。7、油气分布规律方面：根据整个松南地区烃源岩的发育情况,结合有机质丰度、有机质类型及有机质的热演化程度进行综合评价,纵向上以九佛堂组最好,其次为沙海组。平面上,昌图断陷最好,其次为大冷、茫汉。其中,昌图断陷九佛堂组发育四个生烃中心,以南部主洼带泉1井区最为有利；
[Abstract]:In recent years, the Songnan area has shown good exploration momentum. In recent years, Sinopec and Sinopec have concentrated their dominant forces and carried out large-scale exploration and Research on the south of the Songliao basin through various exploration and research methods such as earthquakes, logging and geology. The characteristics of the stratigraphic distribution, sedimentary background, hydrocarbon generation conditions and reservoirs in the Songnan region are also carried out. Petrology and other characteristics have been further understood. Petroleum geologists realize that in Songnan area, not only lonipu fault depression has great exploration potential, and Nakabe Changzu fault depression has great potential for exploration. Comprehensive application of drilling, logging, core, outcrop and seismic data to carry out the study of the characteristics of the Changtu faulted strata. On the basis of the study, the structural characteristics and evolution characteristics of the fault depression are studied through the interpretation of the fine structure of two-dimensional seismic data in the Changtu fault depression, and the study of the core, the single well and the interwell sedimentary facies, the subfacies and the microfacies to determine the pattern of the sedimentary and filling evolution law of the basin, and the comprehensive use of ground ball chemical data, reservoir physical data and reservoir description. On the basis of this, the characteristics of the distribution law of oil and gas are summed up on this basis. Through careful study, we get the following understanding: 1, the structural characteristics of the Changtu fault depression: the whole is a dustpan like fault in the north-south direction of a west fault East. The north deep south is shallow, and the two yuan structure is "down the upper depression". The six structural units are divided into the northern depression belt from north to south, the central uplift zone, the southern main depression belt, the southern subsag belt, the southern subsag belt and the eastern slope zone.2, which are controlled by the paleotectonic and tectonic movement, and the formation is generally west to the East and East thin and is extinguished to the edge of the basin edge, from north to south. The western margin is deposited in the developed fan body affected by the Changtu fault. The main object is inject from the northeast to the braided river delta, and the lithology generally presents the characteristics of the coarse West in the East. The.3 is unconformable with the upper volt Sha Hai formation and the overlying nine fo Tang formation. According to the regional data, the assemblage of sedimentary rotation and lithology, and the characteristics of the paleontological assemblage are found. The stratigraphic division and contrast of the Songnan new area have been carried out in the aspects of the mark layer and seismic reflection characteristics. The results show that the main target strata of the Changtu fault depression are the nine floral formation, the lithology is mainly sand mudstone, the clipping tuff or the volcanic breccia in the longitudinal direction, and the lithologic assemblage of different blocks in the plane is different.4. The reservoir study shows that there are both East-West bi-directional sources in the southern sub concavity of the Changtu fault depression, the west is a fault zone, and the slope and water depth are the product of rapid accumulation. It is mainly coarse clastic deposit and fan delta deposit. The main lithology is tuffaceous breccia and tuffaceous sand conglomerate, the east slope is relatively gentle and the sedimentary thickness is thinner. It is a braided river. The main lithology of the delta is fine sandstone and siltstone.5. The Changtu faulted depression has a complete reservoir cap assemblage: mainly a set of hydrocarbon source rocks, that is, the dark mudstone of the nine fittang formation and 2 sets of reservoirs, that is, the sandstone of the nine fittang formation mudstone section, the sandstone and the gravel of the Sha Hai formation, and the two types of effective hydrocarbon accumulation groups in vertical and horizontal sections. The formation of self reservoir formation assemblage, upper and lower reservoir formation assemblage, the most important.6 for self generation and reservoir formation, the development of dark mudstone in the nine ftang formation in Changtu fault depression, as the main source rock strata. By statistics of the source rock thickness, three sets of hydrocarbon source rocks and source rocks of the lower Cretaceous in the lower Cretaceous, the lower Cretaceous in Changtu fault depression, the source rock of the Sha Hai formation and the Fuxin formation, and the source rocks. The rock types are dark mudstone, carbonaceous mudstone and coal seam and small amount of oil shale. The source rocks are mainly developed in the middle upper.7 of the nine ftang formation, and the distribution regularity of oil and gas: according to the development of the source rock of the whole Songnan area, the organic matter abundance, the organic matter type and the thermal evolution degree of organic matter are synthetically evaluated, and nine in the longitudinal direction. On the plane, the Changtu fault depression is the best, and the second is the great cold and Manh Han. Among them, the nine fo Tang formation in Changtu fault depression developed four hydrocarbon generating centers, and the main area of the southern main depression belt Quan 1 well is the most favorable.
【学位授予单位】：长江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P618.13

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